// pages/work5/index.js
const ppp = require('calc.js')
Page({
    data:{
      num:'0',
      op:''
    },
    lastNum:0,
    isNewNum:false,
    clear(){
      this.isNewNum = true
      this.lastNum = 0
      this.setData({
        num:'0',
        op:''
      })
    },
    delete(){
      let num = this.data.num
      num = num.substr(0,num.length-1)
      num = num==""?'0':num
      this.setData({
        num
      })
    },
    numbtn(e){
        console.log(e)
        let val = e.currentTarget.dataset.val
        let num = this.data.num
      if(num=="0" || this.isNewNum){
        num = val
        this.isNewNum = false
      }else{
        num +=val
      }
      this.setData({
        num
      })
    },
    dotbtn(){
      let num = this.data.num
      if(num.indexOf('.')>=0){
        return
      }
      if(num=='0'){
        num = '0.'
      }else{
        num += '.'
      }
      this.setData({
        num
      })
    },
    opbtn(e){
      console.log(e)
      let op  = this.data.op
      let val = e.currentTarget.dataset.val
      let curNum = Number(this.data.num)
      this.setData({
        op:val
      })
      this.isNewNum = true
      if(this.lastNum == 0){
      this.lastNum = curNum
      return 
      }
      if(op == "+"){
        this.lastNum = ppp.add(this.lastNum,curNum)
      }else if(op=='-'){
        this.lastNum = ppp.sub(this.lastNum,curNum)
      }else if(op=='*'){
        this.lastNum = ppp.mul(this.lastNum,curNum)
      }else if(op=='/'){
        this.lastNum = ppp.div(this.lastNum,curNum)
      }else if(op=='%'){
        this.lastNum %= curNum
      }else if(op=='='){
        this.lastNum = curNum
      }else if(op=='平方'){
        this.lastNum = curNum * curNum;
      }else if(op=='开方'){
        this.lastNum = Math.sqrt(curNum)
      }else if(op=='sin'){
        this.lastNum = Math.sin(curNum)
      }else if(op=='cos'){
        this.lastNum = Math.cos(curNum)
      }

      this.setData({
        num:this.lastNum+''
      })
    }
  })